检索结果-南通市图书馆

American Journal of Plant Sciences 2015年第6期6卷 811-817页

作者： mariangela hungria Marco Antonio Nogueira Ricardo Silva Araujo Embrapa Soja Londrina Brazil Total Biotecnologia Indústria e Comércio Ltda Curitiba Brazil

Legume nodulation by rhizobia can supply crops with nitrogen and reduce environmental impacts caused by chemical fertilization. The soybean crop in Brazil is an impressive example of how biological N2 fixation can be employed with a plant species of high economic value. However, the development of more productive cultivars, along with the increasing global climatic changes demand agricultural practices to become more productive and yet more environmentally friendly. Plant growth-promoting rhizobacteria (PGPR) are highly beneficial to agriculture worldwide, acting in plant nutrition, protection, and growth stimulation. Azospirillum is, certainly, the most employed PGPR in the world, but little is known about its interaction with rhizobia, when both are applied to legume seeds. We have evaluated the co-inoculation of bradyrhizobia and azospirilla on soybean seeds under different soil and climate conditions in Brazil. Our results demonstrated that co-inoculation is efficient and beneficial to the crop, and promotes yield increases without adding any chemical N fertilizers even in soils where established populations of soybean bradyrhizobia exist. The strategy of co-inoculation thus represents a new biotechnological tool to improve soybean yield without adding any chemical N fertilizers, thus contributing to current practices of sustainability in agriculture.

关键词： Soybean Azospirillum Bradyrhizobium Inoculation Yield

Gas Exchanges and Biological Nitrogen Fixation in Soybean under Water Restriction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2014年第26期5卷 4011-4017页

作者： Paula Cerezini Antonio Eduardo Pípolo mariangela hungria Marco Antonio Nogueira Department of Agronomy Universidade Estadual de Londrina Londrina Brazil Embrapa Soybean Londrina Brazil

Biological nitrogen fixation (BNF) in soybean is vulnerable to drought;however, there are genotypic variations among soybean cultivars regarding the ability to keep BNF under moderate water restriction. The aim of this study was to evaluate parameters related to gas exchanges and regulation of BNF in soybean genotypes BNF drought-tolerant (R01-581F and R01-416F), or drought-susceptible (CD 215 and BRS 317), submitted to adequate water supply or restriction between 45 and 55 days after emergence. We searched for traits associated with tolerance/susceptibility to drought, which might be useful in the selection of drought-tolerant soybean genotypes. Plant biomass was not affected under water restriction, but the number and dry weight of nodules reduced by 33% and 12%, respectively, in the average of genotypes. Drought-tolerant genotypes were more effective in maintaining gas exchanges under water restriction. Under water restriction, all genotypes increased the concentration of ureides in nodules, but only the susceptible genotypes showed that in leaves. The maintenance of gas exchanges and N metabolism regulation under water restriction in genotype R01-581F suggests that these parameters may be used to characterize soybean genotypes that can be sources of drought tolerance in genetic breeding programs.

关键词： Bradyrhizobium Drought Glycine max Photosynthesis Ureides

Nodulation Capacity of Argentinean Soybean (Glycine maxL. Merr) Cultivars Inoculated with Commercial Strains of Bradyrhizobium japonicum

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2012年第1期3卷 130-140页

作者： Rubén Darío Salvucci Monica Aulicino mariangela hungria Pedro Alberto Balatti 不详

The purpose of this research was to evaluate the nodulation potential of 31 Argentinean soybean commercial cultivars. Those with the highest nodulation capacity response developed twice the amount of nodules than the low nodulating ones, which is the variation contained in soybean genotypes. Furthermore, this was not due to bacterial promiscuity, since the response was independent of the bradyrhizobia strain inoculated. The ability of cultivars to develop a larger number and biomass of nodules was unrelated with the maturity group they belong to and also was not a response to quorum sensing effects. Our results suggest that breeding programs can be aimed at improving the nodulation capacity of soybean and that cultivars from different maturity groups can be a source of nodulation QTLs.

关键词： Nitrogen Fixation Genetics of Nodulation Soybean-BNF

Co-Inoculation of Soybean with Bradyrhizobium and Azospirillum Promotes Early Nodulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2015年第10期6卷 1641-1649页

作者： Amaral Machaculeha Chibeba Maria de Fátima Guimaraes Osmar Rodrigues Brito Marco Antonio Nogueira Ricardo Silva Araujo mariangela hungria Department of Agronomy Universidade Estadual de Londrina(UEL)LondrinaBrazil Embrapa Soja LondrinaBrazil Total Biotecnologia Indústria e Comércio Ltda CuritibaBrazil

Soybean inoculation with elite strains of Bradyrhizobium to improve nodulation, N2 fixation, and grain yield is well established worldwide. However, when grown in soils where N is deficient, soybean undergoes an initial phase of N starvation that may last up to 20 days after seedling germination due to the lack of synchronism between the phase when seed N reserves are exhausted and the moment when plants begin to benefit from the nitrogen fixed by the bacteria. Practices that promote early nodulation may play a key role in reducing the N starvation period. Azospirillum is a plant growth promoting rhizobacteria (PGPR) that can stimulate root hair formation and root growth, creating more sites for early root infection and nodule formation by N2-fixing Bradyrhizobium spp. In this study, the effects of co-inoculating soybeans with Bradyrhizobium spp. and Azospirillum brasilense on nodulation precocity and N2 fixation were evaluated under greenhouse and field conditions. Nodule number and dry weight, as well as plant and root dry weight and N accumulated in shoots at 15, 18, 21, 24 and 30 days after emergence (DAE) were evaluated in response to inoculation with Bradyrhizobium spp. alone or when co-inoculated with Azospirillum sp. In the greenhouse, co-inoculated plants nodulated precociously as indicated by a significant increase (p Azospirillum helps plants to overcome environmental stresses.

关键词： Biological Nitrogen Fixation Inoculation Soybean Symbiosis